Trimeresurus erythrurus

Trimeresurus erythrurus, commonly known as the red-tailed bamboo pitviper, redtail bamboo pit viper, and redtail pit viper is a venomous pit viper species found in South Asia and Myanmar. No subspecies are currently recognized.

Description
Males grow to a maximum total length 575 mm, of which the tail is 120 mm in length. Females reach a maximum total length of 1,045 mm, with a tail length of 165 mm.

Scalation: dorsal scales in 23–25 longitudinal rows at midbody; first upper labial partially or completely fused to nasal; 9–13 upper labials, 1–2 rows of scales separate upper labials from the suboculars; 11–14 scales in a line between supraoculars; supraoculars rarely divided; temporal scales small, strongly keeled; ventral scales: males 153–174, females: 151–180; subcaudals: males 62–79, females 49–61, usually paired, occasionally unpaired shields present among paired series.

Color pattern: head uniform green, dorsum bright green, light ventrolateral stripe present in males, present or absent in females (Maslin [1942:23] says that the ventrolateral stripe is absent, but M.A. Smith [1943:523] states that it is present in males and variable in females), tail spotted with brown; hemipenes without spines.

Geographic range
Found in eastern India (Assam, Sikkim, Manipur), Bangladesh, Myanmar, Bhutan, and Nepal. The original type locality given was as "Delta Gangeticum" (Ganges Delta, West Bengal State, eastern India). The type locality given by Boulenger (1896) is "Ganges Delta."